### Answer If you're seeing dynamic variables replaced unexpectedly in your webhook response, here are the most common causes: 1. Incorrect response structure for inbound webhooks For inbound webhooks, dynamic variables must be nested under

call_inbound

, not returned at the top level. [(1) ]() [(2) ]() Correct structure:

json
{
  "call_inbound": {
    "dynamic_variables": {
      "first_name": "John",
      "last_name": "Doe"
    }
  }
}

Incorrect structure (will not work) :

json
{
  "retell_llm_dynamic_variables": {
    "first_name": "John"
  }
}

[(2) ]() 2. Webhook configured at wrong level Make sure your inbound webhook URL is configured at the phone number level (in the Phone Numbers tab) , not just at the agent level. 3. For outbound calls When using the Create Phone Call API, set variables in the

retell_llm_dynamic_variables

field directly. [(3) ]() 4. Verify your webhook response Check the Detail Logs in your dashboard to confirm what response your webhook is actually returning. [(2) ]() Could you share: - Is this an inbound or outbound call? - What does your webhook response structure look like?

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

​ To learn more, see the sources I considered: [[1] Inbound webhook](https://docs.retellai.com/features/inbound-call-webhook) [[2] Inbound webhook returns retell_llm_dynamic_variables but agent doesn't receive them](https://community.retellai.com/t/inbound-webhook-returns-retell-llm-dynamic-variables-but-agent-doesnt-receive-them/733) [[3] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) ​